Proposal of Guideline for Judgment of Adjacent Level on Adjacent Construction of Existing Tunnels

Abstract

We performed an anecdotal survey and simulation analysis to clarify the deformation behavior of existing tunnels resulting from adjacent construction of embankments or cuttings. Case studies showed relationships between the deformation modulus of the ground, the geometrical shape of the adjacent construction and their influence on existing tunnels. We confirmed the validity of these relationships through parametric analysis of existing tunnels. Based on the results, we proposed adequate guidelines that are more applicable to construction adjacent to existing tunnels in consideration of the ground stiffness and the geometrical shape of the embankment or cutting.